Lead wire tape



Aug. 30, 1960 Y 'E. P. ANDERSON ETAL 2,951,111

LEAD WIRE TAPE Filed Jan. 16, 1957 1 INVENTORS I EDWARD P. ANDERSON BYWALTER F. DORING K i MM 3M) 5 ATTORN YS United.

N.J., assignors, dustries,

F, Daring, Livingston,

h mesne assi nrnents to Inc., Newark, NJ, a corpo on oi Dela Filed Jan.16, 1957, Ser. No. 634,465

3 Claims. (lCl. 174-117) This invention relates to a novel lead wiretape which finds utility in applications in which it is necessary tosubject a lead wire to great ditlerences in temperature.

More particularly, the novel lead wire tape of this invention findsapplication in connecting transducers to recording instruments where thetransducers are used on rockets, missiles and the like. Transducers arecustomarily cemented to the exterior metal skin of rockets or missiles,and is then necessary to run lead wires from the transducers to therecording instrument mounted inside the rocket or missile body. leadwires must be cemented to the metal skin also since other forms ofbonding such as rivets and the like cannot be used.

As the rocket or missile travels through the air, the air frictioncauses the metal skin to become extremely hot thereby resulting inexpansion thereof and, accordingly, it is necessary to compensate forthe dificrence between the coeflicient of expansion of the metal skinand the coefiicient of expansion of the lead wire. Due to the wide rangeof temperature to wh'ch the rocket or missile is sub jected, thedillerence in coefiicient of ex a on between the missile slain and thelead wire su em to result in the lead wire breaking or pulling loosefrom the contacts unlessprovision is made to co ipensate for thedifference in coefiicient of expansion.

In accordance with the present inventi ties resulting from thisdifference in one sion are overcome by mounting be lead a fabric tape.The tape may be torn of fiber which is unaffected by peraturcs, such asglass or quartz fiber and the like. Tne tape is woven with a relativelyloose mesh so that when it is afilxed to the skin of a missile, for cxarple, a suitable cement will flow through the interstices in the woventape, thereby securing the woven tape to the missile skin. The lead Wireor wires are sewed to the woven tape by means of threads, which areformed from sim temperature resistant fibers to those used in the woventape, and the lead wire is secured to the tape in the form of asinusoidal curve, or any other curve taking a wave form, and thus whenthe lead wire expands and contracts, the expansion and contraction istaken up in a lateral r er than a longitudinal plane so that there is nopossi' nty of the lead wire breaking or becoming detached from thecontacts or the surface to which it has been attached. The lead wire maybe of any type desired, and may, for example, consist of Constantan wirerun axially through a copper tube, the Constantan lead wire beinginsulated from the copper tube by means of an insulating material uch asaluminum oxide refractory dust swaged to a compact condition between thetwo conductors. Other insulating materials such as glass or ceramicmaterials may also be used.

The entire lead wire tape assembly may be bonded to the metal skin of amissile or the like, using a suitable bonding material such as a cementcomprising a mixture of silicone resin, mica, and cristobalite silica,such as that described in copending application Serial No. 633,382,filed January 10, 1957.

the difficulient of expanwire or wires on ed from any type Referring tothe accompanying drawing in which one fronted 39, 19

rile, t ZS tape base having a pair of coaxial cables 4 and d sewedthereto by means of the threads 3 and it. The

coaxial cables are sewn to the woven tape base in the form f asinusoidal curve, or any other curve taking a wave form, so that theadhesion of the coaxial cables and tape to a metal surface is notimpaired due to the difference in coefiicient of expansion of the metalcables a"l that of the metal surface.

in the embodiment shown, the coaxial leads consist of No. 28 Constantanwire run axially through a copper tube having a diameter of 6.043 inch,the Qoiatantan lcad bein insulate-d from the outer tube by aluminumoxide refractory dust swaged between the t o conductors.

it will be obvious to those sxillt l in art that many ic ions may be dewithin the scope of the preseat 1 ven ion without departing from. thespirit thereof, vention includes all such modifications.

wire tape for high temperature applications risint an inelastic open wovbric base made of a material selected from the group consisting of glassand quartz fibers, at least one temperature resistant lead 2d means compg stitch along the length of ire for loosel securing said e to said basein a a y wave-like form, the wire having a length over- 1g said fabricwhich is greater than the fabric base to .ch it is secured, w" ereby the*pansion and contrac- 1 of said wire occurs in a lateral rather than alongiiai plane.

2. A lead wire tape for 1 comprising an inelastic open we len fabric ofa material selected from the group consis of glass quartz fibers; atleast one high t perature resistant osite wi e, including an innerconnector oi low temcoefficient of resists; mate an outer rnetallicsheath, and re aterial spac g said conductor and said shea canscomprisin stitching the length of said e for loosely securing said e tosaid base in '1 gene' y wave-like form, the Wire a length over highlications e made d wire tape for high temperature applications aninelastic open woven fabric base made of al selected from the groupconsisting of glass and -tz fibers, at least one high temperatureresistant lead was having a low temperature coefficient of resistance,and means comprising stitching along the length of said wire for looselysecuring said wire to said base in a generally wave-like form, the wirehaving a length overlying said fabric which is greater than the fabricbase to which it is secured, whereby the expansion and contraction ofsaid wire occurs in a lateral rather than a longitudinal plane.

References Cited in the file of this patent UNITED STATES PATENTS OTHERREFERENCES Fiberglass (publication), copyright 1944, Owens-CorningCorporation, Toledo 1, Ohio, Catalog No. EL44-7, pages 11-14.

